Forming Plurals : Grammar and Spelling Tips

Most words that end in -for -fe change the ending to -ves (e.g. wives, calves), although there are exceptions (e.g. beliefs, chiefs, dwarfs, gulfs, proofs, roofs).

For words that end in a vowel -y, add -s.

Examples : days, boys

If a word ends in a consonant -y, change the -y to -ies.

Examples : babies, spies

Words that end in -o normally just add -s. But there is a group of words that add -oes. These include buffaloes, dominoes, echoes, goes, grottoes, haloes, heroes, mangoes, mosquitoes, potatoes, tomatoes, tornadoes, torpedoes, vetoes, and volcanoes.